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A NOTE has been added to this issue. ====================================================================== http://www.dbmail.org/mantis/view.php?id=1092====================================================================== Reported By: gocka Assigned To: ====================================================================== Project: DBMail Issue ID: 1092 Category: IMAP daemon Reproducibility: have not tried Severity: minor Priority: normal Status: new target: ====================================================================== Date Submitted: 07-Jan-18 11:16 CET Last Modified: 21-May-18 14:26 CEST ====================================================================== Summary: Dbmail - Buffer overflow detected Description: Starting this morning, we started getting notice of buffer overflows. This was terminating the dbmail-imapd service and we had to start it manually each time. This was happening for approximately 1 hour and then it stopped.

Try enable full logging in dbmail.conf file_logging_levels = 511 # syslog_logging_levels = 511 An track down the issue that way.

In my experience (not buffer overflow) but some other issues were comming from: - libzdb (i had to recompile everything) releated to the database driver - selfsign certificates. It seems that enabling the deamon with a selfsign certificate, after a while (in my case the deamon stops) The issue was solved by using haproxy in front of it to handle secure connections and then everything stopped.

In your case, to somehow mitigate the issue you can install a cron job that connects to 143 and then restatarts the deamon if connection reset happens